Mary Haglin, 24, is charged with sexual exploitation by a school employee.

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She was arrested Friday. Online court records don't list the name of an attorney who could comment on Haglin's behalf.

Authorities say she had a sexual relationship with a 17-year-old boy who attended Washington High School.

Haglin told Cedar Rapids station KGAN that she regrets what took place.

The district says that after its investigation it barred Haglin from teaching at district schools. But the district also says that, because of a miscommunication with the substitute placement system, Haglin worked for a short time as an elementary substitute at the end of the 2015-2016 school year.